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Re: Bad Circuit-open Relay Symptoms

your car won't start. the COR turns on the fuel pump relay and thereby the fuel pump, so if it goes bad, no fuel pump, and therefore no start. a lot of people (including me) have just bypassed this relay. it is meant to only turn the fuel pump on when the car is actually cranking over, hence why it takes a couple of turns to actually start instead of just 1.

if you hear your fuel pump (after cranking), then it's fine. by bypassing it, it just means your fuel pump is on when your key is in the "on" position. nothing else as far as i know

Re: Bad Circuit-open Relay Symptoms

Originally Posted by di_rosa

your car won't start. the COR turns on the fuel pump relay and thereby the fuel pump, so if it goes bad, no fuel pump, and therefore no start. a lot of people (including me) have just bypassed this relay. it is meant to only turn the fuel pump on when the car is actually cranking over, hence why it takes a couple of turns to actually start instead of just 1.

if you hear your fuel pump (after cranking), then it's fine. by bypassing it, it just means your fuel pump is on when your key is in the "on" position. nothing else as far as i know

ok when the car is runing meaning the circuit for relay is now closed, the car iruning fine is it possible for the circuit-open relay to cycle back open the circuit and shut the fuel pump down(when runing) or they dont do that?

Re: Bad Circuit-open Relay Symptoms

well, according to the wiring diagrams i've looked it seems that if you pull the relay out, the fuel pump relay will not have power, and therefore won't turn the fuel pump on, so if that is possible, then yeah, the relay can fail and not turn it on..........but shutting off while running, i dunno, that's weird.

it might be easier to just bypass the relay like i was saying, and see if the problem goes away?

Re: Bad Circuit-open Relay Symptoms

Both me and Special are having a problem. Mine will try and crank and will reach about 500 RPM's while cranking, and almost fire (sounds like one or two of the cylinders is starting to fire), but then no fire. If it does fire up, it'll fire up just fine and run perfectly for a couple seconds and even be able to be revved up but then die and refuse to restart. Already checked the igniter today with a brand new one.

Re: Bad Circuit-open Relay Symptoms

Originally Posted by di_rosa

well, according to the wiring diagrams i've looked it seems that if you pull the relay out, the fuel pump relay will not have power, and therefore won't turn the fuel pump on, so if that is possible, then yeah, the relay can fail and not turn it on..........but shutting off while running, i dunno, that's weird.

it might be easier to just bypass the relay like i was saying, and see if the problem goes away?

ok I was bypassing it but with the relay off, i haven't tried with the relay on

Re: Bad Circuit-open Relay Symptoms

Originally Posted by THE1JZSPECIAL

ok I was bypassing it but with the relay off, i haven't tried with the relay on

what do you mean with the relay off? i assume you pulled the COR and put in a thick gauge piece of wire to jump it and then try to start it? did you confirm you did it correctly by listening for the fuel pump when the key is "on" ?

do either of you know for sure that you have stable fuel pressure from like a gauge? do you hear your fuel pump all through the cranking?